* dcrt0.cc (build_argv): Remove unneeded variable.

* select.cc (peek_pipe): Don't check for "ready" if it's already set.
(peek_console): Ditto.
(peek_serial): Ditto.
(peek_socket): Ditto.
(peek_windows): Ditto.

winsup/cygwin/dcrt0.cc

@@ -382,7 +382,6 @@ static void __stdcall
 build_argv (char *cmd, char **&argv, int &argc, int winshell)
 {
   int argvlen = 0;
-  int alloc_cmd = 0;	// command allocated by insert_file
   int nesting = 0;		// monitor "nesting" from insert_file
 
   argc = 0;